[Wallet] Ignore coinbase and zc tx "conflicts"
[Wallet] Ignore coinbase and zc tx "conflicts"

Coinbase and zerocoin transaction can't really be checked for conflicts.
Coinbase has no value anyway.
Zerocoin transactions are checked for zero knowledge proof, the input
hash has no meaning.

PIVX-Project/PIVX,Mrs-X/PIVX,Darknet-Crypto/Darknet,Darknet-Crypto/Darknet,Mrs-X/PIVX,Mrs-X/PIVX,Darknet-Crypto/Darknet,PIVX-Project/PIVX,Mrs-X/PIVX,Mrs-X/Darknet,Mrs-X/Darknet,PIVX-Project/PIVX,Mrs-X/Darknet,PIVX-Project/PIVX,Mrs-X/PIVX,Darknet-Crypto/Darknet,PIVX-Project/PIVX,PIVX-Project/PIVX,Mrs-X/Darknet,PIVX-Project/PIVX,Darknet-Crypto/Darknet,Mrs-X/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,Darknet-Crypto/Darknet,Mrs-X/Darknet,Mrs-X/Darknet